共查询到17条相似文献,搜索用时 62 毫秒
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在图形简化中面状目标间拓扑关系渐进式转换的研究 总被引:1,自引:0,他引:1
拓扑关系是空间关系中最为重要的关系,在空间抽象中,拓扑关系会发生变化,如何控制这种变化?如何在更抽象的层次上维护空间拓扑关系的一致性,就是一个非常重要的问题。本文以拓扑关系成分抽象的转换方法为基础,研究了面之间拓扑关系的抽象规则,并详细探讨了这些拓扑关系的渐进式转换方法,绘制了相应的面之间基本拓扑关系渐进式转换图。 相似文献
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详细讨论了等离线表达地形的规划和以此为基础自动建立等高线关系的方法,对地形特征点、线的提取改进了已有较成熟的方法,建立了一套实用的高等线图形简化的渐进式方法,并对其特殊情况的处理提出了具体的算法。这种方法把不同比例尺跨度的等高线图形综合融为一体,易于实现,等高线图形简化时的等高线相交可在综合过程中控制。 相似文献
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详细讨论了等高线表达地形的规则和以此为基础自动建立等高线关系的方法,对地形特征点、线的提取改进了已有较成熟的方法,建立了一套实用的等高线图形简化的渐进式方法,并对其特殊情况的处理提 出了具体的算法。这种方法把不同比例尺跨度的等高线图形综合融为一体,易于实现,等高线图形简化时的等高线相交可在综合过程中控制。 相似文献
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以地图自动综合为目的,定义了空间目标的几种基本空间关系。总结了道路、水系、居民地等要素之间存在的典型空间关系,着重讨论了它们之间空间关系抽象的规则,为地图自动综合中有效保持空间关系的一致性提供必要的理论基础。 相似文献
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郭庆胜 《武汉大学学报(信息科学版)》1999,24(3):83
讨论了面状要素图形轮廓简化的一些规则以及面的空间知识获取方法,结合以直角方式转折的面状要素图形轮廓的特点,重点讨论了其图形渐进式简化方法。 相似文献
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地图图形数据拓扑关系的建立 总被引:2,自引:0,他引:2
图形矢量数据的拓扑关系是指各图形几何元素之间,不因元素的几何形状和位置变化而发生变化的关系。地图图形数据的拓扑关系主要有两方面内容,一方面是结点与弧段间的关系,另一方面是弧段与多边形间的关系。作为地图图形数据的矢量数据,其拓扑关系是对图形数据进行空间查询、分析等操作的基础,因此,拓扑关系的构造、更新是GIS数据管理和更新的重要内容。本文介绍在DIPNET系统的编辑模块OBEDIT中进行拓扑构造和更 相似文献
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模糊面元素空间拓扑关系抽象化方法研究 总被引:4,自引:3,他引:4
空间拓扑关系的判定是地理信息系统中进行空间查询、空间分析、空间推理等操作的基础.在分析模糊区域空间拓扑关系的基础上,用空间关系向量定量描述这些拓扑关系.依据空间抽象的要求,通过计算向量之间的相关程度,对模糊区域的空间拓扑关系进行抽象,并根据空间拓扑关系的区域分布特征对抽象后的结果进行调整. 相似文献
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Multiple constraints for schematic road network map cartographic design are analyzed and summarized. Based on this, a set of quantitative criteria are set up and a new road network generalization method including progressive selection and displacement is proposed. Furthermore, topological checking methods for road networks are researched. Based on these constraints, the points in a road network are classified, and a satisfactory and effective schematic map is designed in a concrete experiment while maintaining topological consistency of the road network between the original and the schematic map. 相似文献
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研究并总结了示意性道路网地图的制图规则,量化了约束条件,提出了一种道路网渐进式图形简化方法和移位方法,并研究了拓扑关系检查方法。在具体实验中,通过对道路网上点的分类,依据约束条件,快速生成有效的道路网示意性地图,同时保证了原始道路图与示意性道路图之间的拓扑关系一致性。 相似文献
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Multiple constraints for schematic road network map cartographic design are analyzed and summarized. Based on this, a set of quantitative criteria are set up and a new road network generalization method including progressive selection and displacement is proposed. Furthermore, topological checking methods for road networks are researched. Based on these constraints, the points in a road network are classified, and a satisfactory and effective schematic map is designed in a con- crete experiment while maintaining topological consistency of the road network between the original and the schematic map 相似文献
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This paper discusses the rules representing relief with contour lines and methods for automatically constructing relation of contour lines.Meanwhile,the improvement of existent methods for extracting the topographic characteristic points and lines is described.On the basis of this analysis,we propose a series of practicable progressive graphic simplification ideas of contour lines and concrete algorithms for the exception's handling.In this way,graphic generalizations of contour lines at different scales are integrated into one model that is convenient to implement,and in which contour lines' intersection in generalization can be controlled. 相似文献
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This paper discusses the rules representing relief with contour lines and methods for automatically constructing relation of contour lines. Mean-while, the improvement of existent methods for extracting the topographic characteristic points and lines is described. On the basis of this analysis, we propose a series of practicable progressive graphic simplification ideas of contour lines and concrete algorithms for the exception’s handling. In this way, graphic generalizations of contour lines at different scales are integrated into one model that is convenient to implement, and in which contour lines’ intersection in generalization can be controlled. 相似文献
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Some rules of simplification of area feature boundary and the method of acquiring spatial knowledge, such as maintaining area and shape of area feature, are discussed. This paper focuses on the progressive method of graphic simplification of area feature boundary with right angles based on its characteristics. 相似文献